Continuous digester for cellulose pulp including method and recirculation system for such digester
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United States of America Patent
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Oct 23, 2007
Grant Date -
Jun 17, 2004
app pub date -
Mar 19, 2002
filing date -
Mar 21, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The continuous digester is for producing chemical pulp to a process for operating this digester and to a feedback system for the cooking liquid. By means of implementing cooking zones 1st, 2nd, 3rd, 4th and 5th down through the digester, that have a successively decreasing liquid-to-wood ratio, it is possible to obtain a more uniform alkali profile during the cooking. The alkali is kept high at the beginning by means of a high liquid-to-wood ratio, typically over 6:1, which exceeds conventional liquid-to-wood ratios, which are normally around 3.5-5.0:1.
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